Essayist: Knowledge has been defined as a true belief formed by a reliable process.
Definition
True belief formed → Knowledge by reliable process
Objection
If someone was using the process of clairvoyance to reliably come to true beliefs, we wouldn't call that knowledge. (this is trying to show the definition is wrong, by pointing to a counterexample that matches the trigger but not the outcome)
Defense
You're right, we wouldn't call clairvoyance knowledge under my definition, but not because the definition is wrong. It's because clairvoyance doesn't actually fit the trigger: we don't count it as a reliable process. If we did, then it would fit the definition and we would think of it as knowledge.
Evaluate
The author partially agrees with the objection. He agrees to the objection's premise that true beliefs acquired through clairvoyance would not count as knowledge. But disagrees with the objection's conclusion, that this therefore shows the definition is flawed.
He explains that the putative (supposed) counterexample of clairvoyance is not really a counterexample, since it doesn't satisfy the trigger of the definition (since we don't consider it a reliable process).
Goal
Look for something like .